Stock tire size question

Comments

• wagodizzle Council Member and EDM expert

  June 2008

  stock tire size for the EF 13's (STD,DX,LX) are 175/70/13
  
  stock tire size for the EF 14's (Si, EX) are 185/60/14
  
  tirerack.com is a good source for finding stock tire sizes as well.
• bam-bam Council Member

  June 2008

  thanks.
  
  I may run a taller aspect ratio, even a LT tire to fill the fenders... I don't really want a wide tire- this car is about economy, so less contact patch is good.
• bam-bam Council Member

  June 2008

  this one works slick
  
  http://www.miata.net/garage/tirecalc.html
• wagodizzle Council Member and EDM expert

  June 2008

  oh man, that website is sweet! turns out my speedo reads 0.1% too slow, hahaha :roll: im actually going 60.1 mph when my cluster reads 60 mph.
• progress Wagonist

  June 2008

  When my driver's side ball joint failed on me, I had to go with 13s on the front. I didn't realize my speed was off until I got me a Garmin GPS unit. Turns out the 95 MPH I thought I was doing was actually closer to 85+. I never thought going from 14s to 13s could make such a difference with the speedo. Now that I've got 14s on again, my speedo should be reading the proper speed right?
• bam-bam Council Member

  June 2008

  SHOULD be. recheck with GPS, that's how I see that mine is ~5.5 mph off. These online calculators aren't showing me that much of a discrepancy, but The GPS is pretty accurate, and consistent over a good long stretch of road while comparing it to the speedo.
• SiWagon Council Member

  June 2008

  Those speedo calculators are fun,BUT only good for round house estimates .
  
  :? The reality is that there is up to a allowed 7% difference in tire specs between tire companies.We use to find 1/2''(12mm) -1''(25mm) wider thread wides in the same size tire.